I could wester you could wester he could wester we could wester you could wester they could wester
V-ing form
I could be westering you could be westering he could be westering we could be westering you could be westering they could be westering
Perfect
I could have westered you could have westered he could have westered we could have westered you could have westered they could have westered
V-ing perfect
I could have been westering you could have been westering he could have been westering we could have been westering you could have been westering they could have been westering
Negation
Simple form
I couldn't wester you couldn't wester he couldn't wester we couldn't wester you couldn't wester they couldn't wester
V-ing form
I couldn't be westering you couldn't be westering he couldn't be westering we couldn't be westering you couldn't be westering they couldn't be westering
Perfect
I couldn't have westered you couldn't have westered he couldn't have westered we couldn't have westered you couldn't have westered they couldn't have westered
V-ing perfect
I couldn't have been westering you couldn't have been westering he couldn't have been westering we couldn't have been westering you couldn't have been westering they couldn't have been westering
Interrogative form
Simple form
could I wester? could you wester? could he wester? could we wester? could you wester? could they wester?
V-ing form
could I be westering? could you be westering? could he be westering? could we be westering? could you be westering? could they be westering?
Perfect
could I have westered? could you have westered? could he have westered? could we have westered? could you have westered? could they have westered?
V-ing perfect
could I have been westering? could you have been westering? could he have been westering? could we have been westering? could you have been westering? could they have been westering?
Interro-negative form
Simple form
couldn't I wester? couldn't you wester? couldn't he wester? couldn't we wester? couldn't you wester? couldn't they wester?
V-ing form
couldn't I be westering? couldn't you be westering? couldn't he be westering? couldn't we be westering? couldn't you be westering? couldn't they be westering?
Perfect
couldn't I have westered? couldn't you have westered? couldn't he have westered? couldn't we have westered? couldn't you have westered? couldn't they have westered?
V-ing perfect
couldn't I have been westering? couldn't you have been westering? couldn't he have been westering? couldn't we have been westering? couldn't you have been westering? couldn't they have been westering?